Micro-grid system based on VACON industrial inverters

Abstract

The invention provides a micro-grid system based on VACON industrial inverters. The system comprises a power supply unit module containing a unified convertor device, a convertor module and a PLC-based central monitoring and scheduling module. The power supply module of the system comprises a wind power supply unit, a photovoltaic power supply unit and an energy storage power supply unit with two-way power flow. As all power convertor devices of the micro-grid system are based on the VACON industrial inverters having a secondary development function, the universality and maintainability of the power supply convertor device and the scalability and secondary development property of protection and control functions are achieved. The central monitoring and scheduling module achieves system operation state monitoring, fault handling and protection, stable operation control, and coordinated optimization scheduling of all the power supply units. The system provided by the invention is conducive to the control of distributed power supplies.

Description

technical field [0001] The invention relates to the technical field of smart micro-grids, in particular to a micro-grid system based on VACON industrial frequency converters. Background technique [0002] With the continuous development and utilization of new energy, as an effective supplement to centralized power generation, distributed power grid-connected power generation based on new energy has been widely used. In order to solve the problem of effectively connecting distributed power to the grid, improve the grid's ability to accept distributed power, and give full play to the economic value of distributed power, a microgrid is proposed. Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy conversion devices, loads, monitoring and protection devices, etc. It is an autonomous system capable of self-control and management. The research on microgrid has become one of the hot research fields in the direction of ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are still many problems in the construction of the micro-grid system, including: in the construction of the micro-grid system, due to the different types of distributed power sources, different brands of converter equipment are often used to build the micro-grid system according to different distributed power sources, resulting in It is inconvenient to use, manage and maintain, which increases the difficulty of subsequent maintenance and repair and procurement and replacement of related hardware configurations, which affects the practical effect of the system; Reliable secondary development, but there are many communication protocols between them and poor compatibility; RS485 communication is generally used, the communication distance is short, and it does not support the long-distance expansion of distributed power; the system is relatively closed, does not have secondary development functions, and subsequent development The control algorithm cannot be written into the converter, resulting in the inability to quickly deal with faults and inconvenient control of distributed power

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